package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
        @Resource
        private StringRedisTemplate stringRedisTemplate;
        @Resource
        private HttpServletRequest request;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号是否符合规则
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机格式错误");
        }
        //2. 符合手机号规则，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //3.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //4.发送验证码
        log.debug("发送验证码成功，验证码：{}",code);

        return Result.ok();

    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            return Result.fail("手机号格式不对");
        }
        //2.校验验证码 从redis中获取验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode==null || !code.equals(cacheCode)){
            return Result.fail("用户未登录或者验证码错误");
        }
        //3.根据手机号查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();
        //4.用户不存在创建新用户保存到数据库注册
        if (user == null) {
            user=createUser(loginForm.getPhone());
        }
        //5.保存到redis
        //5.1先生成随机token作为key保证唯一性
        String token = UUID.randomUUID().toString(true);
        //5.2将user对象转为Map对象存储
        //避免暴露用户的敏感信息，将user转为UserDTO
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //存储
        String tokenKey=LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        return Result.ok(token);
    }

    @Override
    public Result logout() {
        String token = request.getHeader("authorization");
        stringRedisTemplate.delete(LOGIN_USER_KEY+token);
        return Result.ok();
    }

    @Override
    public Result sign() {
        //1.获取当前登陆的用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //2.1格式化日期  格式化到月份
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //3.拼接key
        String key=USER_SIGN_KEY+userId+keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前登陆的用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //2.1格式化日期  格式化到月份
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //3.拼接key
        String key=USER_SIGN_KEY+userId+keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取到今天为止的所有的签到记录  返回的是一个十进制数字  BITFIELD sign:5:2025112 GET u12 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0)
        );
        if (result==null||result.isEmpty()){
            return Result.ok(Collections.emptyList());
        }
        Long num = result.get(0);
        if (num==null ||num==0){
            return Result.ok(0);
        }
        //6.循环遍历
        int count=0;
        while (true) {
            //7.让这个数字与1做与运算，得到数字的最后一个比特位 //判断这个比特位是否为0
            if ((num&1)==0){
                //为0 未签到 结束
                break;
            }else {
                //不为0  已经签到   计数器加1
                count++;
            }
            //数字右移一位 抛弃最后一个比特位 继续下一个比特位
            num>>>=1;
        }
        return Result.ok(count);
    }

    private User createUser(String phone) {
        User user=new User();
        user.setPhone(phone);
        user.setNickName("user_"+RandomUtil.randomString(6));
        save(user);
        return user;
    }
}
